import Vue from 'vue'
// import Element from 'element-ui'
import VueRouter from 'vue-router'
import Login from '@/components/Login'
import Home from '@/components/Home'
import Welcome from '@/components/Welcome'
import Users from '@/components/user/User'

import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'


Vue.use(VueRouter)

const routes = [{
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },

  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [{
        path: '/welcome',
        component: Welcome
      },
      {
        path: '/users',
        component: Users
      },

      {
        path: '/rights',
        component: Rights
      },
      {
        path: '/roles',
        component: Roles
      },
    ]
  }
]

// 挂载路由导航守卫

const router = new VueRouter({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
})
//为路由对象 添加beforeEach 导航守卫
router.beforeEach((to, from, next) => {
  //to  将要访问的路径
  // from 代表从哪一个路径跳转而来
  // next是一个函数表示放行
  // next() 放行 next('/login')强制跳转

  // 如果用户访问登录页，直接放行
  if (to.path === '/login') return next()
  // 从sessionStorage中获取保存的token值
  const tokenStr = window.sessionStorage.getItem('token')
  // token值为空 就跳转到登录页面
  if (!tokenStr) return next('/login')
  // 执行
  next()
})

export default router
